Elevator safety-lock for vertical doors.



G. S. WILLIAMSON.

ELEVATOR SAFETY LOCK FOR VERTICAL DOORS.

APPLICATION FILED MAR. 24,1916.

Patented Nov 2?, 1917.,

, r ms/W09 ATTORNEY WITNESSES %i g GLENN S. WILLIAMSON, OF NEW YORK, N. Y.

ELEVATOR SAFETY-LOCK FOR VERTICAL DOORS.

Specification of Letters Patent.

Patented Nov.)) 2?, 1291?.

Application filed March 24, 1916. Serial No. 86,450.

To all whom it may concern:

Be it known that I, GLENN S. WILLIAM- SON, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Elevator Safety-Locks for Vertical Doors, of which the following is a specification.

The invention relates to elevator safety systems, and the object is to provide a simple, reliable and eflective form of lock suitable for vertically sliding landing doors, the said lock comprising a latch normally holding the door closed and releasable by a pedaloperated shoe on the car, and further including a detent which holds the shoe and therewith connected controller-locking mechanism in actuated condition while the door is unlocked and until the detent is released by the door in closing. The preferred form of the lock will now be briefly described and the specifically novel combinations will be pointed out in the claims.

In the accompanying drawings:

Figure 1 is an elevation of a portion of the face of the elevator shaft and a portion of a landing door and the lock associated therewith;

Fig. 2 is a fragmentary vertical section through the car, the plane of this view being at right angles to Fig. l;

E Fig. 3 is a plan view of the parts of I ig e is a face view of the lock with its cover plates removed and the detent in holding position behind the car shoe; and

Fig. 5 is a side elevation of the lock looking at the edge nearest the door, showing the parts in their unlocked condition.

The opening at each of the landings is closed by a vertically sliding door 1, which may be counterbalanced in an ordinary manner by a weight sliding in a guide 2 and connected with the top of the door by a cable 3. Attached to the inner face of each of the doors, at the bottom, is a member 4:, which is extended downward below the door, having at its lower end a laterally projecting extremity 5.

fiat case 6 is secured to the face of the elevator shaft at one side of and preferably partially below the door opening, and houses a swinging latch 7 and a biased detent lever S. The latch is mounted on a vertical pivot 9, at the side of the case remote from the door, and is provided at its free portion when the with a pair of vertically spaced locking lugs 10 and 11, the lower of said lugs being positioned to hold the door projection 5 against vertical upward movement when the door is fully closed and the upper lug 11 being adapted to obstruct upward movement when the door is within a safe distance of closing. In its preferred embodiment the latch consists of an approximately rectangular frame having two horizontal bars 12 and 13 extending laterally from the pivot 9, and a vertical bar 14 connecting the horizontal bars and carrying the said locking lugs 10 and 11. The upper of the horizontal bars 12 is formed with a ridged face projection 15, constituting a contact portion to receive the thrust of a vertically extended shoe 16 on the car 17.

The said shoe 16 constitutes an element of mechanism on the car for simultaneously opening the landing door lock and rendering the controller 18 inoperative, so that the car cannot be started while the door lock is open. The said mechanism comprises a transverse rock-shaft 19 mounted in bearings 20 beneath the floor of the car and having a lateral crank arm 21, which is connected with a pedal 22 passing through the floor of the car. At one end of the said rock-shaft, be yond the side of the car, there is provided an upward extending crank arm 23, which is connected with a horizontal bar 241 sliding in bearings on the outside of the car and carrying the shoe at its forward end. Another laterally projecting crank arm 25 011 the rock-shaft connects pivotally with an upward extending rod 26, which passes through the floor of the car and is connected at its upper end with a two-arm lockinglever 27 having a tooth 28 to enter a notch 29 in a sector 30 secured to and movable with the controller handle 31. It will, therefore, be understood that, when the car operator steps on the pedal, the shoe 16 is projected so as to swing the latch 7 out of holding relation to the door projection 5 and simultaneously the controller is locked in neutral position, so that the car cannot be started until the car mechanism is restored to normal condition, which it will be under the action of a spring or counterweight 32 shoe is disengaged by the detent lever 8 in the case 6 adjacent the latch 7.

The said detent lever is a simple two-arm member fulcrumed in a normally substantially vertical position on a pivot 33. Its

upper end is formed with a laterally projecting detent portion 3a opposite the con tact portion 15 of thelatch, and its depending arm or tail affords a linear riding edge 35 on which the door projection travels throughout its terminal range of movement, corresponding approximately to the distance between closed position and the upper looking position of the door. The lever is biased to detaining position by a spring 36.

-What I claim as new is:

1. In an elevator safety system, and in combination with a vertically movable door at a landing; a pro ection on said door, and a latch at the landing to prevent movement of said projection; a shoe on the car adapted to be projected to release said latch, and means operative both to project said shoe and to prevent starting of the car; and a substantially vertical lever fulcrumed intermediate its ends, ad acent said latch, and having on one arm a detent portion to engage behind said shoe and its other arm afl'ording a linear riding portion for engagement by the door projection to disengage the detent portion from the shoe.

2. In an elevator safety system, and in combination with a vertically movable door at a landing; a latch for said door having two vertically spaced locking lugs; a shoe on the car adapted to be projected to release said latch, and means operative both to pro ject said shoe and to prevent starting of the car; and a single biased detent lever at the landing having a detent portion to engage behind the car shoe and a linear riding por tion adapted to be engaged by a door part within the range of door movement corresponding approximately to the space between the locking lugs.

3. In an elevator safety system, and in combination with a vertically movable door at a landing; a projection on said door, and a latch at the landing to prevent movement of said projection, said latch having two vertically spaced locking lugs; a shoe on the car adapted to be projected to release said latch, and means operative both to project said shoe and to prevent starting of the car; and an upright biased lever adjacent said latch, said lever havin a detent portion to engage behind the car shoe and a tail formed for the door projection to ride upon throughout its movement between locking positions.

4. In an elevator safety system, and in combination with a vertically movable door at a landing; a projection on said door, and a latch at the landing to prevent movement of said projection, said latch having two vertically spaced locking lugs; a shoe on the car adapted to be projected to release said latch, and means operative both to project said shoe and to preventstarting of the car; and an upright biased two-arm lever having a laterally projecting detent portion 011 its upper arm to engage behind the car shoe and its lower arm affording a surface upon which said door projection rides throughout its movement between locking positions.

5. In an elevator safety system and in combination with a vertically movable door at a landing; a projection on said door, and a latch pivoted on a vertical axis and having a verticalbar provided with longitudinally spaced locking lugs and a horizontal bar affording a contact portion; a shoe and mechanism on the car for projecting the shoe against said contact portion and for preventing starting of the car; and an uprig-ht biased detent lever adjacent said vertical bar adapted to engage with said shoe and to be disengaged therefrom by the door.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

GLENN S. WILLIAMSON.

Witnesses:

FRANK S. 'HA RTNET'l, EDITH M. CLARK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

